is there a way to convert an audio file into a char array?

[Gary Kline]

On Thu, Dec 31, 2009 at 09:44:33PM +0100, Roland Smith wrote:
> On Thu, Dec 31, 2009 at 12:11:17PM -0800, Gary Kline wrote:
> > 
> > 	Yeah, I views the file with od -c; but wouldn't it be much faster
> > 	to have the data file part of my test program than having to open,
> > 	read, cat thru /dev/dsp each time, close file?  I stole the cat
> > 	from the K&R book, and by reading the click.h data file it seems
> > 	everything would go much faster.
> 
> Just read them all once, at start-up and store them in a buffer. You could use
> mmap(2), but if the sound fragments are small, that might be a waste of memory
> becasue mmap maps at least a page.


	Well, Lowell's thinking right be dead-on if this were just for my
	own use, but considering that I found 3 unix-type click-drivers,
	this "need," however limited, exists.  Below are a few of the misc
	noise files I've collected over the years.  I'm not that famaliar
	with mmap, but below are the click files I have so far.  the Sun's
	are a flat, Klick.  It's a dull thud-like sound while the other
	one, click.* are a nice, solid thunk.  There is a trailing fuzz in
	the after-echo.  that hopefully I'll be able to edit out.  Then it 
	will be the thunk with a brief after-echo.  The Sun produces a
	brief 0.1s BUMP, the click is this neat 0.2 thunk....

	This is full-audio [koff-koff]; I'll play around with MP3 and see
	if the resulting click.wave can be shortened.  It occured to me
	than this click might be too slow for a touch-typist who can do 80
	or 120wpm.  Or anyone who can do up to 40-60wpm.  But then, you are
	probably watching the screen, not the keyboard.  Can easily see if
	you've hit the key(s).



2 -rw-r--r--  1 kline  wheel   914 Sep  4  2005 Klick.au
2 -rw-r--r--  1 kline  wheel  1808 Dec 31 01:15 Klick.wav
2 -rw-r--r--  1 kline  wheel  1263 Sep 16  1997 click.au
2 -rw-r--r--  1 kline  wheel  1275 Sep 16  1997 click.wav


	If I had thought of this use-prefab clicks back in 1999 rather than
	the BEL, problem solving.  ...Still, my disk crashed the following
	morning, so it ---- well, whatever:_)



> 
> I'll send you a utility function I've written to read files into memory off-list.
> 

	Super, thanks,

	gary


> Roland
> -- 
> R.F.Smith                                   http://www.xs4all.nl/~rsmith/
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-- 
 Gary Kline  kline at thought.org  http://www.thought.org  Public Service Unix
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